Podrobný výpis o publikaci

The system is based on digital image processing using proprietary algorithms and has a greater impact on the outcome of the project than the originally intended online electrical network monitor. A precise system for measuring the dilation of two reference systems has the potential for stand-alone ODV protection. It is a transmitter/receiver pair where the transmitter is a laser diode emitting a monochromatic, coherent beam of light with a beam diameter of less than 1 cm. The laser beam is directed at the shield of the other part of the system. The second part contains a digital camera and a minicomputer. The camera captures a point of light projected onto the sensor shield and maps its position. The light source is physically anchored several meters away from the camera, or on a different substrate than the camera system. If the light source moves relative to the camera, this movement is captured by changing the position of the projected point on the sensor shield. Considering that the camera is on a more stable substrate, it is possible to tell exactly how many mm the light source has moved relative to the calibrated starting point. Proprietary algorithms for image binarization and edging and for determining the cluster center will be used to determine the position of the light point. We assume an accuracy of 0.025 mm or better in determining the position or change in position of the light point. This value is perfectly adequate for calibrating the robotic arm, which is not immune to floor dilation because the line implementer does not have a similar device to measure dilation. The output of the result will be used to verify the position of the robotic arm, where the generated data will be continuously stored in the database to determine the degree of floor expansion over time. The functional sample will be used until the end of the project and will become part of the MAKINO production line. We foresee its use for at least the entire sustainability period and its further development. The sensing equipment consists of a laser beam transmitter and an evaluation device with software and a digital camera. The research uncertainty lies in the assumed principle of operation, as well as in the evaluation algorithms for the digital image and the mechanical resistance to external influences. The principle of operation is given in the description of the device, a complication could be the independent movement of not only the laser emitter but also the evaluation device. Then both systems would be in an unspecified state and the dilation result would be numerically very accurate, but practically unusable. However, nothing like this happened, so we did not have to deal with similar situations. The evaluation algorithms are based on already implemented projects and have been adapted appropriately. A complication could arise if the image on the screen was not sufficiently contrasty, or if it was blurred due to the presence of vibrations, or if it was affected by external light. This is a technology that we have mastered and the know-how is needed. The complication mentioned did not occur, or did occur, but without any effect on the result. The algorithms used were robust enough to cope with the situation. External influences were probably the biggest unknown. We assumed the influence of oil, which is ubiquitous in manufacturing and very difficult to eliminate. We assumed periodic cleaning of the sensor, or software correction of possible influences (e.g. periodic calibration, ideally automatic). We assume tests in the chamber at different temperatures and monitoring of the effects of the dilatation of the sensor structure - here 3D printing was used. Furthermore, the effect of temperature on the camera lens, or image deformation and the effect of vapour condensation on the lens when the ambient temperature changes. The above effects were tested in a long-term test laboratory and none of the effects were confirmed.